JPH0449322U

JPH0449322U -

Info

Publication number: JPH0449322U
Application number: JP9104890U
Authority: JP
Priority date: 1990-08-30
Filing date: 1990-08-30
Publication date: 1992-04-27

Description

【図面の簡単な説明】第１図ａは本考案の一実施例に係るデイスク状
情報記録担体のドライブ装置の一実施例の平面図
、第１図ｂは第１図ａの一部を切り欠いた側面図
、第２図ａは第１図ａの拡大された要部平面図、
第２図ｂは第２図ａの−断面図、第３図ａは
第１図ａの磁気回路を示す平面図、第３図ｂは第
３図ａの−断面図、第４図ａは従来例に係る
ドライブ装置の平面図、第４図ｂは第４図ａの一
部を切り欠いた側面図、第５図ａは第４図ａの拡
大された要部平面図、第５図ｂは第５図ａの−
断面図、第６図ａは他の従来例に係る拡大され
た要部平面図、第６図ｂは第６図ａの−断面
図、第７図は第６図ａの磁気回路を示す平面図、
第８図は第６図ａの平面図振動モードを示すため
の要部斜視図である。３……光デイスク（情報記録担体）、５……デ
ツキ（装置本体）、１１……対物レンズ、１３…
…対物レンズホルダ、１５……キヤリツジ、２１
……リニアモータ（アクチユエータ）、２３ａ…
…外ヨーク（第１の磁路）、２３ｂ……内ヨーク
（第２の磁路）、２５……永久磁石、２７……コ
イル、２９……磁気空隙。[Brief Description of the Drawings] Fig. 1a is a plan view of an embodiment of a drive device for a disk-shaped information recording carrier according to an embodiment of the present invention, and Fig. 1b is a partially cutaway view of Fig. 1a. A cutaway side view, FIG. 2 a is an enlarged plan view of the main part of FIG. 1 a,
Figure 2b is a cross-sectional view of Figure 2a, Figure 3a is a plan view showing the magnetic circuit of Figure 1a, Figure 3b is a cross-sectional view of Figure 3a, and Figure 4a is a cross-sectional view of Figure 2a. FIG. 4b is a partially cutaway side view of FIG. 4a, and FIG. 5a is an enlarged plan view of the main part of FIG. 4a, FIG. b is − in Figure 5 a.
6a is an enlarged plan view of main parts of another conventional example, FIG. 6b is a cross-sectional view of FIG. 6a, and FIG. 7 is a plan view showing the magnetic circuit of FIG. 6a. figure,
FIG. 8 is a perspective view of a main part to show the vibration mode in the plan view of FIG. 6a. 3... Optical disk (information recording carrier), 5... Deck (apparatus main body), 11... Objective lens, 13...
...Objective lens holder, 15...Carriage, 21
...Linear motor (actuator), 23a...
...outer yoke (first magnetic path), 23b...inner yoke (second magnetic path), 25...permanent magnet, 27...coil, 29...magnetic gap.

Claims

[Claims for Utility Model Registration] (1) In order to optically record information on a disk-shaped information recording carrier or to read recorded information, an objective lens that irradiates the information recording carrier with a light beam from a light source; , an objective lens holder to which the objective lens is fixed, and a carriage in which the objective lens holder is movably supported along the optical axis direction of the objective lens and movable on the apparatus main body in the radial direction of the information recording carrier. and an actuator for moving the objective lens holder in the optical axis direction in order to focus the light beam by the objective lens onto the information recording carrier, the actuator comprising: A magnetic circuit consisting of a first magnetic path fixedly disposed on the device body and having a permanent magnet fixed thereto, and a second magnetic path through which a magnetic flux flows from the first magnetic path through a magnetic gap. , a coil arranged to face the magnetic circuit and configured to allow current to flow in a direction perpendicular to the direction of magnetic flux flowing through the magnetic gap of the magnetic circuit, and the first magnetic path is connected to the device main body. A drive device for a disk-shaped information recording carrier, characterized in that the second magnetic path is fixed to the carriage, and the coil is fixed to the objective lens holder. (2) In the disk-shaped information recording carrier drive device according to claim (1), the magnetic gap of the magnetic circuit is located at symmetrical positions along the track direction of the information recording carrier with the center of gravity of the objective lens holder as the center. the first magnetic path has a shape that surrounds the movement area of the carriage, and the permanent magnet is located in the first magnetic path.
2. A drive device for a disk-shaped information recording carrier, wherein the coil is connected to a magnetic path, and the coil is disposed between the second magnetic path and the first magnetic path. (3) In the drive device for a disk-shaped information recording carrier according to claim (1) or (2), the second magnetic path has a U-shaped cross section, and the second magnetic path has a coil fixed to the objective lens holder. is arranged around the free end of the second magnetic path.